Barbecue Mushroom Pizza

Name: Barbecue Mushroom Pizza
Ingredients: 1/4 cup apple cider vinegar; 1 teaspoon sugar; Kosher salt; 1/4 small red onion, thinly sliced; 6 tablespoons extra-virgin olive oil; 3/4 pound oyster mushrooms, torn into thin strips; Freshly ground pepper; 3 cloves garlic, finely chopped; 1/3 cup plus 1/4 cup barbecue sauce; 1 15- to 16-ounce ball pizza dough; 4 ounces smoked gouda cheese, shredded (about 1 1/3 cups); 2 ounces Monterey Jack cheese, shredded (about 1/2 cup); 1 scallion, thinly sliced; 2 tablespoons chopped fresh cilantro